## Beyond the K\"ahler cone

### Abstract

The moduli space of nonlinear $\sigma$-models on a Calabi--Yau manifold contains a complexification of the K\"ahler cone of the manifold. We describe a physically natural analytic continuation process which links the complexified K\"ahler cones of birationally equivalent Calabi--Yau manifolds. The enlarged moduli space includes a complexification of Kawamata's movable cone''. We formulate a natural conjecture about the action of the birational automorphism group on this cone. (Based in part on joint work with Paul Aspinwall and Brian Greene; submitted to the proceedings of Hirzebruch's 65th birthday workshop in algebraic geometry''.)Comment: 19 pages, AmS-TeX 2.1, DUK-M-94-0

Topics: Mathematics - Algebraic Geometry
Year: 1994
OAI identifier: oai:arXiv.org:alg-geom/9407007

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